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on 601 CPUs skip to normal memcpy if both source and destination are 32bit

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aligned
This commit is contained in:
macallan 2014-03-04 17:05:14 +00:00
parent ab7ecd2ca6
commit 1890dda80c
1 changed files with 8 additions and 5 deletions
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13
common/lib/libc/arch/powerpc/string/memcpy.S
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@ -1,4 +1,4 @@
/* $NetBSD: memcpy.S,v 1.5 2014/03/03 18:55:02 matt Exp $ */
/* $NetBSD: memcpy.S,v 1.6 2014/03/04 17:05:14 macallan Exp $ */
/* stropt/memcpy_440.S, pl_string_common, pl_linux 10/11/04 11:45:36
* ==========================================================================
@ -73,11 +73,14 @@ ENTRY(memcpy)
* not available. Maybe want to have a different memcpy for 601
* that checks for page boundaries/word alignment...
*/
mfspr %r6, 287 /* mfpvbr %r6 PVR = 287 */
srwi %r6, %r6, 0x10 /* get version field from PVR */
cmpwi %r6, 0x1 /* 601 CPU = 0x0001 */
bne bnorm /* skip byte-only unless 601 */
mfspr %r6, 287 /* mfpvbr %r6 PVR = 287 */
srwi %r6, %r6, 0x10 /* get version field from PVR */
cmpwi %r6, 0x1 /* 601 CPU = 0x0001 */
bne bnorm /* skip byte-only unless 601 */
or %r6, %r3, %r4 /* see if both source and dest */
andi. %r6, %r6, 3 /* are 32bit aligned */
beq bnorm /* skip byte-only if they are */
bcpy:
mtctr %r5 /* byte copy everything */
li %r6, 0